/* ==========================================================================
   ERSAN TEKNİK MÜHENDİSLİK & İNŞAAT - RESMİ WEB SİTESİ
   Modern Mimari & İnşaat Tasarım Sistemi
   ========================================================================== */

:root {
  /* Renk Paleti */
  --color-primary: #0C233C;        /* Koyu Lacivert / Kurumsal Mühendislik */
  --color-primary-light: #16375C;  /* Orta Lacivert */
  --color-primary-dark: #071728;   /* Çok Koyu Lacivert */
  
  --color-accent: #E28906;         /* Altın / İnşaat Amber */
  --color-accent-light: #F5AF19;   /* Parlak Altın */
  --color-accent-dark: #B86B00;    /* Koyu Altın */

  --color-text-main: #1F2937;      /* Ana Metin Rengi */
  --color-text-muted: #4B5563;     /* İkincil Metin */
  --color-text-light: #9CA3AF;     /* Açık Gri Metin */

  --color-bg-page: #F8FAFC;        /* Sayfa Arka Planı */
  --color-bg-card: #FFFFFF;        /* Kart Arka Planı */
  --color-bg-subtle: #F1F5F9;      /* Yumuşak Gri Alanlar */

  --color-border: #E2E8F0;         /* Standart Çizgi Rengi */
  --color-border-focus: #CBD5E1;   /* Odaklanma Çerçevesi */

  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-info: #0284C7;

  /* Tipografi */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-heading: 'Outfit', 'Inter', system-ui, sans-serif;

  /* Gölgeler */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 20px rgba(226, 137, 6, 0.35);

  /* Yuvarlama & Geçişler */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);

  --container-max: 1240px;
}

/* ==========================================================================
   RESET & GENEL STİLLER
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-page);
  color: var(--color-text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

body.menu-locked {
  overflow: hidden;
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* ==========================================================================
   BUTONLAR & ROZETLER
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  text-align: center;
  white-space: nowrap;
}

.btn-sm {
  padding: 0.5rem 0.9rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-full {
  width: 100%;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #FFFFFF;
  border: 1px solid var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent));
  color: #0C233C;
  font-weight: 700;
  box-shadow: var(--shadow-md);
}

.btn-accent:hover {
  background: linear-gradient(135deg, #FFB82E, #D17C00);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-outline-primary {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}

.btn-outline-primary:hover {
  background-color: var(--color-primary);
  color: #FFFFFF;
}

.btn-whatsapp {
  background: linear-gradient(135deg, #075E54 0%, #0E7064 100%);
  color: #FFFFFF;
  font-weight: 700;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(0, 0, 0, 0.15);
  box-shadow: 0 3px 8px rgba(7, 94, 84, 0.25);
}

.btn-whatsapp:hover {
  background: linear-gradient(135deg, #05463E 0%, #09594F 100%);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(7, 94, 84, 0.45);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-full);
}

.badge-success {
  background-color: rgba(16, 185, 129, 0.18);
  color: #10B981;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.badge-warning {
  background-color: rgba(245, 158, 11, 0.18);
  color: #F59E0B;
  border: 1px solid rgba(245, 158, 11, 0.35);
}

.badge-info {
  background-color: rgba(2, 132, 199, 0.18);
  color: #38BDF8;
  border: 1px solid rgba(56, 189, 248, 0.35);
}

/* ==========================================================================
   ÜST BİLGİ ŞERİDİ (TOP BAR) & HEADER
   ========================================================================== */
.top-bar {
  background-color: var(--color-primary-dark);
  color: #D1D5DB;
  font-size: 0.8rem;
  padding: 0.45rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.top-bar-info, .top-bar-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.top-bar-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.top-bar-item svg {
  color: var(--color-accent-light);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.header-scrolled {
  box-shadow: var(--shadow-md);
  background-color: rgba(255, 255, 255, 0.98);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-img {
  height: 56px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text-main);
  position: relative;
  padding: 0.5rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2.5px;
  background-color: var(--color-accent);
  transition: width var(--transition-normal);
  border-radius: var(--radius-full);
}

.nav-link:hover {
  color: var(--color-accent-dark);
}

.nav-link:hover::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
}

.nav-toggle span {
  display: block;
  height: 2.5px;
  width: 100%;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

/* ==========================================================================
   HERO (GİRİŞ) BÖLÜMÜ
   ========================================================================== */
.hero-section {
  position: relative;
  background: linear-gradient(135deg, #091C30 0%, #16375C 100%);
  color: #FFFFFF;
  padding: 5.5rem 0 6rem;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 20% 30%, rgba(226, 137, 6, 0.15) 0%, transparent 45%),
    radial-gradient(circle at 80% 80%, rgba(2, 132, 199, 0.15) 0%, transparent 40%),
    linear-gradient(rgba(12, 35, 60, 0.85), rgba(12, 35, 60, 0.92)),
    url('https://images.unsplash.com/photo-1541888946425-d0fbb186c5f7?auto=format&fit=crop&w=1800&q=80');
  background-size: cover;
  background-position: center;
  opacity: 0.9;
  z-index: 1;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 3.5rem;
}

.hero-tagline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background-color: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent-light);
  margin-bottom: 1.25rem;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.hero-title span {
  color: var(--color-accent-light);
  background: linear-gradient(135deg, #FFCE63, #E28906);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: #D1D5DB;
  margin-bottom: 2rem;
  max-width: 620px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.hero-stats-card {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  box-shadow: var(--shadow-xl);
}

.stat-box {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--color-accent-light);
  line-height: 1;
  margin-bottom: 0.35rem;
}

.stat-label {
  font-size: 0.85rem;
  color: #E5E7EB;
  font-weight: 500;
}

/* ==========================================================================
   BÖLÜM BAŞLIKLARI
   ========================================================================== */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3.5rem;
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent-dark);
  margin-bottom: 0.6rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.35rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.25;
  margin-bottom: 1rem;
}

.section-lead {
  font-size: 1.05rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   HAKKIMIZDA & MÜHENDİSLİK GÜVENCESİ
   ========================================================================== */
.about-section {
  padding: 5.5rem 0;
  background-color: #FFFFFF;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.about-image-stack {
  position: relative;
}

.about-main-img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
}

.about-badge-card {
  position: absolute;
  bottom: -1.5rem;
  right: -1.5rem;
  background-color: var(--color-primary);
  color: #FFFFFF;
  padding: 1.5rem 2rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  border-left: 5px solid var(--color-accent);
}

.badge-card-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--color-accent-light);
  line-height: 1;
}

.badge-card-text {
  font-size: 0.85rem;
  color: #D1D5DB;
  font-weight: 600;
}

/* Hakkımızda - Çalışma Prensipleri paneli */
.about-pillars {
  background: linear-gradient(160deg, var(--color-primary) 0%, #1e3a5f 100%);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
  border-top: 5px solid var(--color-accent);
}

.about-pillars-eyebrow {
  color: var(--color-accent-light);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.about-pillar {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.about-pillar:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.about-pillar-icon {
  flex: 0 0 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-pillar-title {
  color: #FFFFFF;
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 0.2rem;
}

.about-pillar-desc {
  color: #D1D5DB;
  font-size: 0.9rem;
  line-height: 1.5;
}

.about-content h2 {
  font-size: 2.1rem;
  font-family: var(--font-heading);
  color: var(--color-primary);
  margin-bottom: 1.25rem;
  line-height: 1.3;
}

.about-content p {
  color: var(--color-text-muted);
  margin-bottom: 1.2rem;
  font-size: 1rem;
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.75rem 0;
}

.highlight-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.highlight-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background-color: rgba(226, 137, 6, 0.15);
  color: var(--color-accent-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.highlight-text {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
}

.engineers-team {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.engineers-team .engineer-sign {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.engineer-sign {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.engineer-avatar {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background-color: var(--color-primary-light);
  color: var(--color-accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 800;
}

.engineer-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
}

.engineer-role {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   HİZMETLERİMİZ
   ========================================================================== */
.services-section {
  padding: 5.5rem 0;
  background-color: var(--color-bg-page);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}

.service-card {
  background: var(--color-bg-card);
  padding: 2.2rem 1.8rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(226, 137, 6, 0.4);
}

.service-icon {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background-color: rgba(12, 35, 60, 0.05);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  transition: all var(--transition-normal);
}

.service-card:hover .service-icon {
  background-color: var(--color-accent);
  color: #FFFFFF;
}

.service-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.85rem;
}

.service-desc {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   PROJELERİMİZ (İNŞAATLAR VE YAN YANA RESİM ÖNİZLEMESİ)
   ========================================================================== */
.projects-section {
  padding: 5.5rem 0 6.5rem;
  background-color: #FFFFFF;
}

.filter-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 3rem;
}

.filter-btn {
  padding: 0.55rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background-color: var(--color-bg-subtle);
  color: var(--color-text-muted);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  background-color: #E2E8F0;
  color: var(--color-primary);
}

.filter-btn.active {
  background-color: var(--color-primary);
  color: #FFFFFF;
  box-shadow: var(--shadow-sm);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 2.25rem;
}

/* PROJE KARTI */
.project-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(12, 35, 60, 0.2);
}

.project-cover-wrapper {
  position: relative;
  height: 240px;
  overflow: hidden;
  cursor: pointer;
  background-color: #E2E8F0;
}

.project-cover-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.project-cover-wrapper:hover .project-cover-img {
  transform: scale(1.06);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: rgba(12, 35, 60, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.project-cover-wrapper:hover .project-overlay {
  opacity: 1;
}

.overlay-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255, 255, 255, 0.95);
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
  transform: translateY(8px);
  transition: transform var(--transition-normal);
}

.project-cover-wrapper:hover .overlay-badge {
  transform: translateY(0);
}

.project-badge {
  position: absolute;
  top: 0.9rem;
  left: 0.9rem;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  z-index: 5;
}

/* Durum Noktası (Dot) */
.project-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

/* Yüksek Kontrastlı ve Buzlu Cam Efektli Durum Kartları */
.project-badge.badge-success {
  background: rgba(6, 78, 59, 0.88); /* Koyu Zümrüt Cam */
  color: #E6FFFA;                    /* Çok Açık, Net Beyaz-Nane */
  border: 1px solid rgba(52, 211, 153, 0.55);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6);
}

.project-badge.badge-success::before {
  background-color: #34D399;
  box-shadow: 0 0 8px #34D399;
}

.project-badge.badge-warning {
  background: rgba(120, 53, 15, 0.9); /* Koyu Kehribar Cam */
  color: #FEF3C7;                     /* Çok Açık Sarı */
  border: 1px solid rgba(251, 191, 36, 0.55);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6);
}

.project-badge.badge-warning::before {
  background-color: #FBBF24;
  box-shadow: 0 0 8px #FBBF24;
}

.project-badge.badge-info {
  background: rgba(12, 74, 110, 0.9); /* Koyu Mavi Cam */
  color: #E0F2FE;                     /* Çok Açık Mavi */
  border: 1px solid rgba(56, 189, 248, 0.55);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6);
}

.project-badge.badge-info::before {
  background-color: #38BDF8;
  box-shadow: 0 0 8px #38BDF8;
}

.project-type-tag {
  position: absolute;
  top: 0.9rem;
  right: 0.9rem;
  background: rgba(12, 35, 60, 0.88);
  color: #FFFFFF;
  font-size: 0.74rem;
  font-weight: 600;
  padding: 0.35rem 0.7rem;
  border-radius: var(--radius-sm);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
  z-index: 5;
}

.project-info {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-header {
  margin-bottom: 0.75rem;
}

.project-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
}

.project-subtitle {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent-dark);
}

.project-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  padding-bottom: 1rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

/* YAN YANA RESİM ÖNİZLEME ŞERİDİ (KULLANICININ İSTEDİĞİ EN ÖNEMLİ BÖLÜM) */
.project-gallery-preview {
  background-color: var(--color-bg-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  margin-bottom: 1.25rem;
  border: 1px dashed var(--color-border);
}

.gallery-preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.65rem;
}

.gallery-preview-title {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary);
}

.gallery-hint {
  font-size: 0.75rem;
  color: var(--color-accent-dark);
  font-weight: 600;
}

.preview-thumbnails-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.thumb-item {
  position: relative;
  width: 62px;
  height: 62px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  flex-shrink: 0;
  background-color: #E2E8F0;
}

.thumb-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.thumb-item:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.thumb-item:hover img {
  transform: scale(1.1);
}

.thumb-item.active-cover {
  border-color: var(--color-primary);
}

.thumb-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(12, 35, 60, 0.85);
  color: #FFFFFF;
  font-size: 0.6rem;
  font-weight: 700;
  text-align: center;
  padding: 1px 0;
}

.thumb-item.thumb-more {
  background-color: var(--color-primary);
  color: #FFFFFF;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 1.1;
}

.thumb-item.thumb-more span {
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--color-accent-light);
}

.thumb-item.thumb-more small {
  font-size: 0.65rem;
  color: #D1D5DB;
  font-weight: 600;
}

.single-image-note {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-style: italic;
  padding: 0.5rem;
}

.project-actions {
  margin-top: auto;
}

/* ==========================================================================
   MODERN NATIVE LIGHTBOX <dialog> & GALERİ
   (Modern Web Guidance & Baseline Uyumlu)
   ========================================================================== */
dialog.lightbox-dialog {
  position: fixed;
  inset: 0;
  margin: auto;
  width: min(92vw, 1180px);
  max-height: 92vh;
  border: none;
  border-radius: var(--radius-lg);
  background-color: var(--color-primary-dark);
  color: #FFFFFF;
  padding: 0;
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  z-index: 999;
}

/* Modern Web Guidance: Sayfa arkasının kaymasını önler */
dialog:modal {
  overscroll-behavior: contain;
}

dialog::backdrop {
  overflow: hidden;
  overscroll-behavior: contain;
  background: rgba(7, 23, 40, 0.82);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* Yumuşak Açılış & Kapanış Animasyonu (@starting-style & allow-discrete) */
dialog[open] {
  opacity: 1;
  transform: scale(1);

  @starting-style {
    opacity: 0;
    transform: scale(0.96);
  }
}

dialog {
  opacity: 0;
  transform: scale(0.96);
  transition-property: opacity, transform, display, overlay;
  transition-duration: 0.25s;
  transition-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
  transition-behavior: allow-discrete;
}

dialog::backdrop {
  opacity: 0;
  transition-property: opacity, display, overlay;
  transition-duration: 0.25s;
  transition-timing-function: ease-out;
  transition-behavior: allow-discrete;
}

dialog[open]::backdrop {
  opacity: 1;

  @starting-style {
    opacity: 0;
  }
}

/* Lightbox İçerik Düzeni */
.lightbox-container {
  display: flex;
  flex-direction: column;
  height: 86vh;
}

/* Lightbox Başlık Çubuğu */
.lightbox-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 1.75rem;
  background-color: rgba(12, 35, 60, 0.95);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  flex-shrink: 0;
}

.lightbox-title-group h2 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 0.25rem;
}

.lightbox-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.82rem;
  color: #9CA3AF;
}

.lightbox-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.lightbox-counter {
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.35rem 0.75rem;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  color: var(--color-accent-light);
}

.lightbox-close-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background-color: rgba(255, 255, 255, 0.12);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.lightbox-close-btn:hover {
  background-color: #EF4444;
  transform: rotate(90deg);
}

/* Lightbox Gövdesi: Sahne + Sağ Detay Paneli */
.lightbox-body {
  display: grid;
  grid-template-columns: 1fr 340px;
  flex-grow: 1;
  overflow: hidden;
  background-color: #071728;
}

/* Sol Taraf: Büyük Resim Sahnesi */
.lightbox-stage {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: radial-gradient(circle at center, #0e2744 0%, #05101d 100%);
  overflow: hidden;
}

.lightbox-img-wrapper {
  position: relative;
  max-width: 100%;
  max-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

#lightbox-main-img {
  max-width: 100%;
  max-height: 52vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-xl);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

#lightbox-main-img.img-loading {
  opacity: 0.4;
  transform: scale(0.98);
}

/* Navigasyon Ok Butonları */
.lightbox-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: rgba(12, 35, 60, 0.75);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all var(--transition-fast);
  z-index: 10;
}

.lightbox-nav-btn:hover {
  background: var(--color-accent);
  color: #0C233C;
  transform: translateY(-50%) scale(1.1);
}

.lightbox-nav-prev {
  left: 1.5rem;
}

.lightbox-nav-next {
  right: 1.5rem;
}

.lightbox-caption-bar {
  position: absolute;
  bottom: 0.75rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(12, 35, 60, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 0.45rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: #E5E7EB;
  border: 1px solid rgba(255, 255, 255, 0.15);
  white-space: nowrap;
}

/* Sağ Taraf: Bina Özellikleri & Bilgi Alma */
.lightbox-sidebar {
  background-color: var(--color-primary);
  border-left: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.lightbox-sidebar-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-accent-light);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.lightbox-features-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 2rem;
}

.lightbox-features-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: #E5E7EB;
}

.lightbox-features-list li svg {
  color: var(--color-accent-light);
  flex-shrink: 0;
  margin-top: 3px;
}

.lightbox-cta-box {
  margin-top: auto;
  background: rgba(255, 255, 255, 0.05);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.lightbox-cta-box p {
  font-size: 0.82rem;
  color: #D1D5DB;
  margin-bottom: 1rem;
}

/* Lightbox Altı Thumbnail Şeridi (Tıklanabilir Küçük Resimler) */
.lightbox-footer-strip {
  background-color: var(--color-primary-dark);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.85rem 1.5rem;
  flex-shrink: 0;
}

.lightbox-thumbs-scroll {
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
}

.lightbox-thumbs-scroll::-webkit-scrollbar {
  height: 6px;
}

.lightbox-thumbs-scroll::-webkit-scrollbar-thumb {
  background-color: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
}

.lightbox-thumb-btn {
  width: 70px;
  height: 52px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  border: 2px solid transparent;
  opacity: 0.6;
  transition: all var(--transition-fast);
  background-color: #000000;
}

.lightbox-thumb-btn img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.lightbox-thumb-btn:hover {
  opacity: 1;
  border-color: rgba(255, 255, 255, 0.5);
}

.lightbox-thumb-btn.active {
  opacity: 1;
  border-color: var(--color-accent-light);
  box-shadow: 0 0 10px rgba(226, 137, 6, 0.5);
  transform: scale(1.05);
}

/* ==========================================================================
   NEDEN BİZ? (MÜHENDİSLİK AVANTAJLARI)
   ========================================================================== */
.why-us-section {
  padding: 5.5rem 0;
  background-color: var(--color-primary);
  color: #FFFFFF;
}

.why-us-section .section-title {
  color: #FFFFFF;
}

.why-us-section .section-lead {
  color: #D1D5DB;
}

.why-us-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}

.why-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.75rem;
  transition: all var(--transition-normal);
}

.why-card:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-accent);
  transform: translateY(-5px);
}

.why-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background-color: rgba(226, 137, 6, 0.15);
  color: var(--color-accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.why-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 0.75rem;
}

.why-card p {
  font-size: 0.9rem;
  color: #D1D5DB;
  line-height: 1.6;
}

/* ==========================================================================
   İLETİŞİM BÖLÜMÜ & HARİTA
   ========================================================================== */
.contact-section {
  padding: 5.5rem 0;
  background-color: var(--color-bg-page);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3.5rem;
}

.contact-info-panel {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact-card-box {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: 2rem;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.office-item {
  margin-bottom: 1.75rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--color-border);
}

.office-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.office-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.65rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.office-detail {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.office-detail svg {
  color: var(--color-accent-dark);
  flex-shrink: 0;
  margin-top: 3px;
}

.contact-form-box {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}

.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  background-color: var(--color-bg-subtle);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-main);
  transition: all var(--transition-fast);
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  outline: none;
  border-color: var(--color-accent);
  background-color: #FFFFFF;
  box-shadow: 0 0 0 3px rgba(226, 137, 6, 0.15);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-status-msg {
  display: none;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.form-status-msg.status-success {
  background-color: rgba(16, 185, 129, 0.12);
  color: #065F46;
  border: 1px solid #10B981;
}

.form-status-msg.status-error {
  background-color: rgba(239, 68, 68, 0.12);
  color: #991B1B;
  border: 1px solid #EF4444;
}

/* Harita Bölümü */
.map-wrapper {
  margin-top: 3.5rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  height: 380px;
}

.map-wrapper iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* ==========================================================================
   FOOTER (ALT BİLGİ)
   ========================================================================== */
.site-footer {
  background-color: var(--color-primary-dark);
  color: #9CA3AF;
  padding: 5rem 0 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 3rem;
  margin-bottom: 4rem;
}

.footer-logo {
  height: 56px;
  width: auto;
  background: #FFFFFF;
  padding: 0.5rem 0.85rem;
  border-radius: 10px;
  margin-bottom: 1.25rem;
}

.footer-desc {
  font-size: 0.9rem;
  line-height: 1.6;
  color: #D1D5DB;
  margin-bottom: 1.5rem;
}

.footer-col h4 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 1.25rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-links a {
  font-size: 0.9rem;
  color: #9CA3AF;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-accent-light);
  transform: translateX(3px);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
}

/* ==========================================================================
   SABİT HIZLI İLETİŞİM BUTONLARI (WHATSAPP & TELEFON)
   ========================================================================== */
.floating-actions {
  position: fixed;
  bottom: 1.75rem;
  right: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: 90;
}

.floating-btn {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-xl);
  color: #FFFFFF;
  transition: all var(--transition-normal);
}

.floating-whatsapp {
  background: linear-gradient(135deg, #075E54 0%, #0E7064 100%);
}

.floating-whatsapp:hover {
  background: linear-gradient(135deg, #05463E 0%, #09594F 100%);
  transform: scale(1.1);
  box-shadow: 0 8px 24px rgba(7, 94, 84, 0.6);
}

.floating-phone {
  background-color: var(--color-primary);
}

.floating-phone:hover {
  background-color: var(--color-primary-light);
  transform: scale(1.1);
}

/* ==========================================================================
   SCROLL REVEAL ANİMASYONLARI
   ========================================================================== */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-on-scroll.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   RESPONSIVE MEDYA SORGULARI (TABLET & MOBİL)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .lightbox-body {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr auto;
  }

  .lightbox-sidebar {
    border-left: none;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    max-height: 220px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .top-bar {
    display: none;
  }

  .nav-menu {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background-color: #FFFFFF;
    flex-direction: column;
    padding: 2rem;
    box-shadow: var(--shadow-xl);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }

  .nav-menu.nav-menu-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-title {
    font-size: 2.3rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-stats-card {
    grid-template-columns: 1fr 1fr;
    padding: 1.5rem;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .lightbox-nav-btn {
    width: 38px;
    height: 38px;
  }

  .lightbox-nav-prev {
    left: 0.5rem;
  }

  .lightbox-nav-next {
    right: 0.5rem;
  }
}